Unearthed Arcana Releases
Here is a semi-recent copy of all the UAs released for 5th since it's release.
Updating2~4 times a year I check for 5th updates and archive them using the standard format so I'll start providing a copy for you guys to sync up to as well. Due to this, keep an eye out for recent discussions for the newest releases as this is mostly just an archive that runs a few months behind (besides, WotC probably tracks web traffic, so download the newest ones from them to contribute to 5th).
Current LinkHereChange Log06-15-17, uploaded my archive as of May which contains 35 entries.